Trigorilla Fan Mount for Stepper Controller / TMC2100

thingiverse

This is a compact fan mounting bracket for the Trigorilla Mainboard on the Anycubic Linear Kossel. I designed this as an easy way to attach a 40mm radial blower fan to cool my TMC2100 stepper drivers without printing a fully enclosed tunnel, since I already have a panel between the hot bed and PCB in place. The fan is attached by driving a 3mm screw directly into the bracket, which cuts its own thread. The bracket is secured to the PCB with one M3 screw and nut. I connected the fan to the unused FAN1 connector on the Trigorilla board, which is controlled by PIN 7 of the controller board. I accomplished this by making the following changes in Marlin "Configuration_adv.h": ``` #define USE_CONTROLLER_FAN #if ENABLED(USE_CONTROLLER_FAN) #define CONTROLLER_FAN_PIN 7 // FAN1 is Pin 7 on Trigorilla Board #define CONTROLLERFAN_SECS 60 // Duration in seconds to run after motors disabled #define CONTROLLERFAN_SPEED 255 // 255 == full speed #endif ``` This setup works really well as the fan turns on automatically when the stepper drivers are enabled and runs for another 60 seconds after they are turned off. It took me a while to get the TMC2100 drivers working properly. In an attempt to make it use spreadCycle mode, I started by cutting off the CFG1-3 pins and bridging CFG1 to GND with a wire. However, this had no effect on the particular TMC2100 driver I'm using. The drivers were still in stealthChop and kept missing steps and skewing layers, regardless of which Vref I used. Eventually, I discovered there are two tiny solder pads under the board that need to be bridged to connect CFG1 to GND and enable spreadCycle mode. Now it finally works well...